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>Chapter 15. <SPAN
CLASS="APPLICATION"
>Spine</SPAN
></H1
><P
>			<SPAN
CLASS="APPLICATION"
>Spine</SPAN
> is the fast replacement for cmd.php. It is written in C to ensure ultimate
			performance for device polling. Expect a decrease in polling time of an order of magnitude.
			Polling times far less than 60 seconds for about 20,000 data sources are achievable
			e.g. on a dual XEON system supplied with 4 GB RAM and standard local disks.
		</P
><P
>			When using <SPAN
CLASS="APPLICATION"
>Spine</SPAN
>, don't change crontab settings! Always use poller.php with crontab!
			To activate <SPAN
CLASS="APPLICATION"
>Spine</SPAN
> instead of cmd.php, please visit <SPAN
CLASS="GUILABEL"
>Settings</SPAN
>
			and select the <SPAN
CLASS="GUILABEL"
>Poller</SPAN
> tab. Select <SPAN
CLASS="APPLICATION"
>Spine</SPAN
>
			and save. Now, poller.php will use <SPAN
CLASS="APPLICATION"
>Spine</SPAN
> on all subsequent polling cycles.
		</P
><P
>			While <SPAN
CLASS="APPLICATION"
>Spine</SPAN
> is really fast, choosing the correct setup will ensure, that all processor
			resources are used. Required settings for <SPAN
CLASS="GUILABEL"
>Maximum Concurrent Poller Processes</SPAN
>
			are 1-2 times the number of CPU cores available for <SPAN
CLASS="APPLICATION"
>Spine</SPAN
>.
		</P
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><P
><B
>Table 15-1. <SPAN
CLASS="APPLICATION"
>Spine</SPAN
> Specific Execution Parameters</B
></P
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>Name</TH
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>Description</TH
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><TR
><TD
>Maximum Threads per Process</TD
><TD
>The maximum threads allowed per process.
						Using a higher number when using <SPAN
CLASS="APPLICATION"
>Spine</SPAN
> will improve performance.
						Required settings are 10-15. Values above 50 are most often insane
						and may degrade preformance</TD
></TR
><TR
><TD
>Number of PHP Script Servers</TD
><TD
>The number of concurrent script server processes to run per <SPAN
CLASS="APPLICATION"
>Spine</SPAN
> process.
						Settings between 1 and 10 are accepted.
						Script Servers will pre-load a PHP environment.
						Then, the Script Server Scripts are included into that environment to
						save the overhead of reloading PHP each and every time.</TD
></TR
><TR
><TD
>Script and Script Server Timeout Value</TD
><TD
>The maximum time that <SPAN
CLASS="APPLICATION"
>Spine</SPAN
> will wait on a script to complete, in units of seconds.
						If a Script Server Script is terminated due to timeout conditions,
						the value entered into the rrd file will be NaN</TD
></TR
><TR
><TD
>The Maximum SNMP OID's Per SNMP Get Request</TD
><TD
>The maximum number of snmp get OID's to issue per snmp request.
						Increasing this value speeds poller performance over slow links.
						The maximum value is 60 OID's. Please bear in mind, that some
						type of devices do not accept huge OID numbers and may fail if set above 1.
						That's why cacti 0.8.7 allows to define this value at device level</TD
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